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Oracle defines a number of official build platforms, with carefully specified versions of operating systems, compilers and other build tools. If you report a failure to build on any of these platforms, the report will be processed with high priority from the build team on in Oracle. Under normal circumstances, a build on any of these platforms will always succeed. 

In in extension addition to the official build platforms, OpenJDK can normally be built on many more platforms. For these platforms, there is no guarantee that the build will succeed. The Oracle build team can help to solve some problems encountered, but only on a best-effort basis. In addition to the Oracle build team, the OpenJDK community at large is welcome to help with making OpenJDK compile on these platforms. 

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